/*
 * Copyright (c) 2016, 2017, 2018, 2019 FabricMC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.fabricmc.fabric.api.event.client.player;

import net.fabricmc.fabric.api.event.Event;
import net.fabricmc.fabric.api.event.EventFactory;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.item.ItemStack;
import net.minecraft.util.hit.HitResult;

/**
 * This event is emitted during the block-picking process. It can be used to
 * modify the returned ItemStack, as well as nullify it - returning an empty
 * ItemStack will cause the event to leave, and no block to be picked.
 */
public interface ClientPickBlockApplyCallback {
	public static final Event<ClientPickBlockApplyCallback> EVENT = EventFactory.createArrayBacked(ClientPickBlockApplyCallback.class,
		(listeners) -> (player, result, _stack) -> {
			ItemStack stack = _stack;

			for (ClientPickBlockApplyCallback event : listeners) {
				stack = event.pick(player, result, stack);
				if (stack.isEmpty()) {
					return ItemStack.EMPTY;
				}
			}

			return stack;
		}
	);

	ItemStack pick(PlayerEntity player, HitResult result, ItemStack stack);
}
